Car truck



I March 31, 1942.

E. J..MAATMAN CAR TRUCK Filed Oct. 2, 1959 2 Sheets-Sheet 1 March 31, 1942. E. J. QM AATMAN CAR TRUCK Filed 001;. 2. 1939 2 Sheets-Sheet 2 ATTORNEY.

Patented Mar. 31, 1942 can. TRUCK Egbert J. Maatman, Chicago, 111., .assignor to I American Steel Foundries, Chicago, 11]., a corporation of New Jersey Application October 2, 1939, Serial No. 297,456

2a Claims. (01. 105-197) My invention relates to car trucks, and more particularly to a car truck-of the quick wheelchange type having housed within the bolster chamber a friction absorbing device for the prevention of undue vertical oscillation of bolster springs.

An object of my invention is to provide afriction absorbing device of simple means and construction for damping vertical oscillations of the bolster springs.

Another object of my invention is to provide a friction absorbing device which has augmenting capacity to resist downward movement of .the bolster in cooperationwith the bolster springs.

Another object is to provide a friction absorbing device to act as, snubbing means for the recoil of the'bolster springs.

A further object of my invention a friction absorbing device which is of compact form and may be readily assembled and secured within the bolster before the bolster is placed in the side frame.

A still further object is to provide means whereby the side frame may be easily and quickly slipped off the bolster end without dismantling the friction device, thus permitting a quick-wheel change.

Yet another object of my invention is to provide a novel method of connecting the bolster with the side frame,

Referring to the drawings, Figure l'is a side elevation of a car truck embodying my invention.

Figure 2 is a fragmentary plan view, partly in section, with the bolster and friction unit removed, the section being taken along the line 2-2 as indicated in Figure 1.

Figure 3 is an enlarged fragmentary side elevation showing my device in more detail.

Figure 4 is an enlarged view in section through the vertical plane bisecting the truck transverse- 1y as indicated by the line 4-4 in Figure 1.

Figure 5 is a fragmentary top plan view of the side frame and bolster connection.

Figure 6 is a sectional view taken along the line 6-6 in Figure 5.

Figure '7 is a sectional view, the section being taken along the line 1-1 as indicated in Figure 3.

Figure 8 is an end view of myfriction shoe; and

Figure 9 is a side elevation thereof taken from the left as seen in Figure 8.

Figure 10 is aplan view of my wear plate; and

Figure 10A is a side elevation thereof.

Describing the drawings in more detail, the wheeiand axle assemblies generally indicated as is to provide through the journal connections at 3, 3 support a side frame 4 having a compression member 6, a tension member 8 and bolsterguide columns l8, l6 defining the bolster opening l2. Integrally formed with and connecting; the bolster columns immediately below the bolster opening I2 is the bridge wall or girder l4 having a bottom wall i6, side walls l8, l8, and a top wall 20 with horizontally projecting lugs or ears 22, 22

perforated at 23, 23. Adjacent the bolster guide columns I0, lo, the bridge wall or girder l4 may be. slotted or grooved .as at 24, 24 to receive the side walls 26, 26 of the bolster 28 as the bolster moves downwardly under load, and suificient clearance is allowed so that the bottom faces 30, 36 of the side walls will clear the bottom surfaces 32, 32 of-the said slots under maximum loading conditions.

The seat 34 which supports the bolster springs 36, 36 may be of any'desired shape, shownhere as substantially hexagonal, having central reinforcing 'ribs 38, 38 and other reinforcing ribs 48, 40 adjacentjthe bolster columns, as well as spaced transverse reinforcing ribs 42, 42 on its under face. The upper surface 44 of the spring shelf 34 may be relieved as at '46, 46 to provide accurate seating for bolster springs 36, 36 positioned by means of annular flanges 48, 48 formed thereon. 0n the lower surface 56 of'the bottom wall 52 of the bolster are formed annular flanges 54, 54 which serve as positioning means for the upper -endsof -the bolster springs 36, 36, said surface being similarly arcuately relieved as -at 56 to provide accurate seating of the bolster springs. The bottom wall 52 of the bolster 28 has an aperture or opening 58 contoured as at 58 to the top plate 26 of the bridge 44 so that the said bridge may be received therein. The

upwardly projecting and inwardly extending flanges 66, 66 on the bottom wall. of the bolster may be formed adjacent the aperture 58 to limit lateral motion of the bolster.

Seated on the upper surface of the top wall 20 of the bridge or girder is the wear plate 62 of substantially rectangular shape having ears I or lugs 64, s4 and bolt holes as, as therein in at 2, 2 are of a type in common usage and 66 alignmentwith holes 23, 23 in the lugs 22, 22. The friction surface 68 (Figure 7) of the wear plate 62 engages as at 18 with the friction surfaces l2, 12 of the shoes or wedges 14, 1'4 and said wear plate may be secured to said top wall 20 by means of bolts I6, 16 extending through the aligned bolt holes 66, 66 and 23, 23. On each side of the lugs 22, 22 of the bridge wall I4, the wear plate 62 projects slightly beyond the side .84 slidably engage the wear plate 82.

walls I8, I8 of said bridge as at 82, 82 to afford engagement with the bent-over flanges 84, 84 of the friction shoes I4, I4, as is best shown in Figure 7, and thus retaining said shoes in position. Resilient means are interposed between the friction shoes I4, I4 (shown here as a coil spring 88), the said spring being positioned on the inner faces 81, 81 of said shoes'by means of annular flanges 88, 88 relieved at 88, 98 to provide accurate seating. The resilient member 88 urges the friction shoes 14, I4 outwardly, causing the diagonal friction surfaces 92, 82 of said shoes to engage with the friction surfaces 94, 84 of the chafing plates 98, 98 as at 88 (Figure 3).

-Formed on the outer surfaces I88, I88 of said shown which is merely by way of illustration and friction shoes may be the lugs I82, I82 whichproject outwardly into slots I84, I 84 in the bolster side walls 28, 28 as is best shown in Figure 8, thus providing interlocking means for holding the device in assembled relationship within the bolster chamber.

The chafing plates 98, 98 may be of rectangular shape and may be secured by means of rivets I88, I88 to the diagonal walls H8, H8 of the bolster. Said walls I I8, II8 are integrally formed with the top wall 2 arm the side walls 26, 26 of the bolster thus forming hollow chambers I I8, II8. Access to the rivets I88, I88 is afforded through circular openings H8, H8.

To assemble my device the friction shoes I4, 14

are slid over the opposite ends of the wear plate 82 in such manner that the bent-over flanges 84, At the same time, a resilient member may be placed between the shoes and positioned on the antion device are aligned with the holes in the flange on the top plate of the bridge or girder. The friction device is then secured to the bridge of the side frame by means of a nut and bolt assembly.

In operation, as the bolster moves downwardly, the chafing plates within the bolster frictionally engage with complementary friction surfaces on the friction shoes, moving said shoes inwardly i and thereby causing the friction surfaces on the bottom of the shoes to engage frictionally with the wear plate on the side frame girder, the inward movement of the friction shoes being resisted by the resilient member interposed therebetween. When the bolster moves upwardly by reason of the recoil of the bolster springs, the

' action of the friction shoe and resilient member is such that the recoil action of the bolster springs is diminished in effect and dampened.

It may also be noted that to remove the side frame, it is necessary only to unfasten the nut and bolt assembly securing the wear plate to the side frame girder, lift the bolster upwardly to disengage the bolster coil springsand slip the side frame off the bolster end, 'the friction unit remaining in assembled relationship within the' bolster.

It is to be understood that I do not wish to be limited by the exact embodiment of the device not limitation as various and other forms of the device will, of course, be apparent to those skilled in the art without departing from the spirit of the invention or the scopeof the claims.'

I claim:

1. In a car truck, a side frame, a bolster opening defined by a compression member, spaced guide columns, and a wall extending between said columns, a bolster received within said opening and having internal diagonal friction surfaces extending between the top and side walls of said bolster, a friction absorbing device enclosed within said bolster comprising wedge block's having diagonal friction surfaces, a resilient member interposed therebetween and urging said blocks into engagement with said internal diagonal surfaces, a member supported from said blocks having frictional engagement therewith, means securing said member to said first-mentioned wall to maintain said frame and. bolster in assembled relationship, and automatically interlocking means for-holding said deviceinassembled relationship within said bolster.

2. In a quick wheel change truck, a side frame having a bolster opening, a bolster received therein, a friction absorbing device enclosed within said bolster comprising friction shoes having a resilient member interposed therebetween, diagonal surfaces formed within said bolster between top and side walls thereof in frictional engagement with said shoes, a fiat member interlocked with said shoes for frictional engagement therewith, said member being secured to said frame for maintaining said bolster and frame in assembled relationship, means for limiting lateral motion of said bolster, and means accommodating relative vertical movement of said frame and. bolster. I

3. In a quick wheel change truck, a side frame having a bolster opening, a bolster received therein with an aperture in its bottom wall, a fric tion absorbing device enclosed within said bolster above said aperture and comprising friction shoes having a resilient member interposed therebetween, diagonal surfaces formed within said bolster in frictional engagement withsaid shoes, a member interlocked with said shoes and secured to said side frame through said aperture, means within said bolster-cooperating with said shoes. for limiting lateral motion of said bolster, and means on said shoes automatically interlocking with means in the side walls of said bolster to maintain said device in assembled relationship during assembly and dismantling of said bolster and side frame.

4. In a quick wheel change truck, a side frame having a bolster opening defined by bolster guide columns and top and bottom members, said bottom member having a box-like section forming a bridge wall between said columns, a bolster received in 'said opening having an aperture in its bottom wall, a friction absorbing device insertable throughsaid aperture and associated withsaid bridge wall, said device being automatically interlocked in position within said bolster whereby said device is retained in assembly during dismantling of said bolster and sidev frame, and means for accommodating relative movement of said bolster and said frame,' said' meansIcoinprising slots in said bridgewall adjacent said.

columns and top and bottom members, said bot- (gagin said wedge faces, a member carried by tom member having a box section, a bolster received in said. opening having an aperture in its bottom wall, a friction absorbing device insertable through said aperture and cooperating with said box section, said device being automatically interlocked within said bolster, whereby disassembly of said device is prevented during dismantling of said bolster and side frame, and means for accommodating relative movement of said bolster and said frame, saidmeans comprising slots in said box section inwardly of said columns adapted to receive the side walls of said bolster. Y

6. In a quick wheel change truck, a side frame having a bolster opening, a bolster received therein having an aperture in one of its walls, a friction absorbing device enclosed in said bolster comprising friction shoes having resilient means interposed therebetween; diagonal friction surfaces within said bolster engaghig said shoes, 9. member carried by said shoes forfrictional engagement therewith and associated with said side frame through said aperture for tying said bolster and side frame together, and means for holding said device in assembled relationship within said-bolster during assembly and disassembly of said bolster and side frame, said means including lugs on said shoes automatically interlocking with slots in the side walls of said bolsten' r '7. In a quick wheel change truck, a side frame having a bolster opening, a bolster received therein, a friction absorbing device enclosed within said bolster comprising friction shoes having a resilient member interposed therebetween, diagonal surfaces formed between top and side walls of said bolster in frictional engagement with said shoes, a member supported from said shoes and fastened to said-frame to maintain said frame and bolster in assembled relationship, and stop means within said bolster abutting adjacent lower portions of said shoes for limiting lateral motion of said bolster.

8. In a quick wheel change truck, a side frame having a bolster opening, a bolster received therein, a friction absorbing device enclosed within said bolster comprising friction shoes having a resilient member interposed therebetween, diagonal friction surfaces extending between the top and side walls of said bolster engaging said shoes, 9. member carried by said shoes for frictional engagement therewith and associated with said frame, and means on said shoes automatically interlocking with the side walls of said bolster to retain said device in assembled relationship.

9. In a quick wheel change truck, a side frame having a bolster opening defined by bolster guide columns and top and bottom members, said bottom member having a box section, a bolster received in said opening having an aperture in its bottom wall, a friction absorbing device insertable through said aperture and automatically interlocked within said bolster and associated with said frame, and means for accommodating relative movement of said bolster and said frame including vertical slots in saidsection inwardly of said columns.

10. In a quick wheel change truck, a side frame having a bolster opening, a bolster received therein, a friction absorbing device enclosed within said bolster and comprising friction shoes presenting wedge faces and flat bottom faces, a resilient member interposed between said shoes, diagonal friction surfaces within said bolster en- .a friction absorbing device within said bolster,

means for limiting lateral movement of said bolster comprising lugs formedv adjacent opposite sides of said aperture for abutment with said device, and means securing said device to said side frame to retain said bolster and side frame in squared relationship.

12. In a quick wheelchange truck, a side frame having a bolster opening; a bolster received therein, a friction absorbing device carried'. in said bolster, and means for maintaining said bolster and said side frame in assembled relationship, said means comprising a member supported from opposite ends of said device and secured intermediate its ends to a side frame member.

13. In a quick wheel change truck, aside frame having a bolster opening, a bfolster received therein, a friction absorbing device carried in said bolster, and meansfor maintaining said bolster and said side frame in assembled relationship, said means including a member interlocked at opposite ends with said de ice, means for securing said member to said frame and comprising aligned lugs on said member and said frame, and a securing member.

14. In a quick wheel change truck, a side frame having a bolster opening, a bolster received therein having an aperture in its bottom wall to accommodate a member of said side frame, a friction absorbing device interlocked in position within said bolster and connected to said member whereby said bolster and side frame are maintained in assembly, and lugs adjacent said aperture for abutment with opposite sides of said device to limit lateral motion of said bolster.

15. In a quick wheel change truck, a side frame having a bolster opening,-a bolster received therein, and means for limiting lateral movement of said bolster, said means including an aperture in the bottom wall of said'bolster receiving a portion of said frame, a friction device operable within said bolster and associated with said bolster and said portion of said frame, and lugs formed on said wall adjacent opposite sides of said aperture for abutment with said friction device.

16. Ina quick wheel change truck, a side frame having a bolster opening, a bolster received there- I in, a friction absorbing device operable within said bolster and comprising diagonal surfaces formed within said bolster between top and side walls thereof, and friction shoes resiliently sup- 7 ported in engagement with said surfaces, and means for connecting said bolster to said side frame, said means including a horizontal member interlocked at opposite ends with said device and secured to said side frame.

17. In a quick wheel. change truck, a side frame locked within said bolster and secured to said wall whereby said. bolster and side frame are retained in assembled relationship.

19. ha quick wheel change truck, a side frame having a bolster opening defined by .top and bottom members, spaced columns, and a wall connecting said columns, a bolster received in said opening, an aperture in the bottom wall of said bolster, a friction device operablewithin said bolster, interlocking means'on said device and said bolster, and means securing said device to said wall, said interlocking means and said securing means serving as the sole means for tying said bolster and side frame together.

20. In a quick wheel change truck, a side frame having a bolster opening defined by top and bottom members, spaced columns, and a bridge wall connecting said columns, a bolster received in said openings, a friction device enclosed within said bolster and comprising a resilient member, tapering friction surfaces formed within said bolster, shoes urged into engagement with said surfaces by said resilient member, retainingmeans on said shoes engaging the side walls of said bolster, and a member engaging said shoes and secured to said wall to maintain said side frame and'bolster in assembly.

21. In a quick wheel change truck, a side frame having a bolster opening defined by top and bottom members, spaced columns, and a bridge wall connecting said columns, a bolster received in said opening, a friction device enclosed within said bolster'and comprising a resilient member, tapering friction surfaces formed within said bolster,shoesurgedintoentwithsaid surfaces by said resilient. member, retaining meansonsaidshoesengaging thesidewallsof said bolster, a member associated with said shoes and said wall, and lugs on the bottom wall of 1 having a bolster opening defined by top and bottom members, spaced columns, and a wall extending between said columns, a bolster received in said'opening and having an aperture 'in the bottom wall thereof, friction means enclosed within said bolster above said aperture, said means comprising diagonally arranged surfaces between the top and side walls of said bolster,

friction shoes having faces engaging said surfaces, a resilient member compressed between said shoes, a member cooperating with said first mentioned wall and said shoes to tie said side frame and bolster together, and means on said shoes eligas s said bolster to retain said device therewithin.

23. In a'quick wheel change truck, a side frame having a bolster opening, a bolster received therein, a friction-device operable within said bolster and comprising friction shoes and resilient means compressed therebetween, wedge face engagement between said shoes and said. bolster, a member interlocked with said shoes and having 'fiat face engagement therewith, said member ;being associated with said side frame, and automatic means retaining said device in assembled relationship within said bolster during assem bling and dismantling of said bolster and side frame.

EGBERT J. MAATMIAN. 

